Hairbrush



FIG. 1 is a front perspective view of a hairbrush, showing our new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a hairbrush, as shown and described. 